7208 ACD/P4AQBTC
7200 & 7300 Series Super Precision Angular Contact Ball Bearings
Image may differ from product. See technical specification for details.
Part No.
Part No.
7208 ACD/P4AQBTC
Basic Information
System of measurement
Metric
Weight
1.49 kg
Tolerance class
P4A
Seal type
Open
For load direction
Angular Contact
Main Dimensions
Bore diameter
40 mm
Bore diameter tolerance
-0.004mm to 0
Outside diameter
80 mm
Outside diameter tolerance
-0.004mm to 0
Width
72 mm
Width tolerance
-0.2mm to 0
Contact angle
25 °
Ball & Washer Dimensions
Ball diameter
11.112 mm
Ball quantity
14
Performance
Temperature range
- 30°C to 110 °C
Radial dynamic load rating
19170 lbf
Radial static load rating
20588 lbf
Limiting speed
41 X 1000 rpm
Lubrication
Lubricated
Matched arrangement
Quadruplex Tandem Back-to-Back (QBT)
Number of bearings in matched set
4
Universal matching bearing
No (Standard)
Preload
Moderate / Class C
Materials
Ring material
Chrome Steel
Ball material
Chrome Steel
Cage material
Phenolic
Technical Drawings
No drawings available at the moment, will be launched soon
In Stock
Price available upon request.
Our sales team will respond within 24 hours with a competitive quote tailored to your requirements.
REQUEST A QUOTE
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
7208 ACD/P4AQBTC Bearing Product Overview & Core Advantages
The 7208 ACD/P4AQBTC is a precision angular contact ball bearing designed for demanding applications requiring exceptional rigidity and load capacity. This quadruplex matched set features a tandem back-to-back (QBT) arrangement, enabling it to handle significant combined loads (radial and axial) in a compact envelope. Manufactured to P4A tolerance class with a moderate preload (Class C), it delivers high running accuracy, excellent rotational stability, and is optimized for high-speed operation up to 41,000 rpm, making it ideal for high-precision, high-reliability machinery.
7208 ACD/P4AQBTC Bearing Model Code Explained, Specifications & Naming Convention
The model number 7208 ACD/P4AQBTC is decoded as follows:
- 7208: Basic series designation for a metric angular contact ball bearing with a 40mm bore and 80mm outside diameter.
- AC: Angular Contact design with a 25° contact angle.
- D: Signifies a duplex (two-bearing) set. In this context, it is part of a larger matched set.
- P4A: Denotes an ultra-precision tolerance class exceeding ABEC 7, ensuring minimal runout and vibration.
- QBT: Indicates the specific matched arrangement as a Quadruplex (four bearings) Tandem Back-to-Back configuration.
- C: Specifies the moderate preload level (Class C).
7208 ACD/P4AQBTC Bearing Structural Features & Performance Benefits
- Superior Rigidity and Load Capacity: The quadruplex back-to-back arrangement creates an extremely rigid bearing system capable of withstanding heavy combined radial and axial loads from both directions. The 25° contact angle is optimized for sustaining high axial loads.
- High-Speed Performance: The lightweight phenolic resin cage reduces centrifugal forces, while the precision-ground chrome steel balls and raceways minimize friction and heat generation, collectively enabling the high limiting speed of 41,000 rpm.
- Precision Engineering: Manufactured to P4A tolerance class with tight dimensional control on bore, outside diameter, and width, this bearing ensures high running accuracy, reduced vibration, and predictable performance in precision spindles.
- Optimized for Matched Sets: The bearings are selectively matched as a set of four to ensure uniform load distribution and consistent preload, which is critical for the stability and longevity of the entire assembly.
7208 ACD/P4AQBTC Bearing Typical Application Areas
This high-precision bearing set is engineered for advanced applications where maximum rigidity and speed are paramount. Key industries and equipment include:
- Machine Tool Spindles: High-speed milling, grinding, and turning centers.
- Precision Spindles: PCB drilling spindles and other high-frequency motor spindles.
- High-Frequency Applications: Where minimal deflection and high rotational accuracy are required.
